package com.uum.gateway.swagger;

import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

/**
 * 聚合各个服务的swagger接口
 */
@Slf4j
@Component
@Primary
@AllArgsConstructor
public class SwaggerResourceConfig implements SwaggerResourcesProvider {

    private final RouteLocator routeLocator;
    private final GatewayProperties gatewayProperties;


    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        //取出gateway的route
        routeLocator.getRoutes().subscribe(route ->
                routes.add(route.getId())
        );
        //结合配置的route-路径(Path)，和route过滤，只获取有效的route节点
        gatewayProperties.getRoutes().stream().filter(
                        routeDefinition -> routes.contains(routeDefinition.getId()))
                /**
                 * RouteDefinition{id='系统服务', predicates=[PredicateDefinition{name='Path', args={_genkey_0=/uum-admin/**}}], filters=[FilterDefinition{name='StripPrefix', args={_genkey_0=1}}], uri=lb://uum-admin, order=0, metadata={}}
                 * 构建SwaggerResource对象
                 * 构建location把args={_genkey_0=/uum-admin/**}}中的/uum-admin/**转成 /uum-admin/v2/api-docs
                 *
                 */
                .forEach(route -> {
                    route.getPredicates().stream()
                            .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                            .forEach(predicateDefinition -> resources.add(swaggerResource(route.getId(),
                                    predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                            .replace("**", "v2/api-docs"))));
                });

        return resources;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        log.info("name:{},location:{}", name, location);
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;
    }

}
